I've no experience with what is allowed in Egypt but as I've mentioned you can't delete channels.
If you think that this channels are not allowed in Egypt you'd need to open a ticket and if that is the case Extreme needs to fix the software to not allow (show) this channels for the domain region.
Could you post a screenshot of the window with the custom channels.
Is the AP set for Egypt - because if the AP is set for the correct country it should only show/allow channels that are supported/allowed in that country,